var MeinFenster; //PopUP Fenster


function FensterOeffnen (Adresse, width, height)
{
  	if (!width>0)
  	{
  		width = 640;
  	}
  	if (!height>0)
  	{
  		height=480;
  	}

  	if (!MeinFenster)
  	{
  		MeinFenster;
  	}
  	else if(MeinFenster.closed==false)
  	{
  		MeinFenster.close();
  	}

  	if (Adresse=="")
  	{
  		return false;
  	}

  	var parameter = "width="+width+",height="+height+",scrollbars=yes";
  	MeinFenster = window.open(Adresse, "Zweitfenster", parameter);
  	MeinFenster.focus();
  	window.onunload = FensterSchliessen;
}

function FensterSchliessen()
{
	if (MeinFenster && MeinFenster.closed==false)
	{
		//MeinFenster.close();
	}
}